1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2019 Google LLC
4 *
5 * Sysfs properties to view and modify EC-controlled features on Wilco devices.
6 * The entries will appear under /sys/bus/platform/devices/GOOG000C:00/
7 *
8 * See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
9 */
10
11 #include <linux/platform_data/wilco-ec.h>
12 #include <linux/sysfs.h>
13
14 #define CMD_KB_CMOS 0x7C
15 #define SUB_CMD_KB_CMOS_AUTO_ON 0x03
16
17 struct boot_on_ac_request {
18 u8 cmd; /* Always CMD_KB_CMOS */
19 u8 reserved1;
20 u8 sub_cmd; /* Always SUB_CMD_KB_CMOS_AUTO_ON */
21 u8 reserved3to5[3];
22 u8 val; /* Either 0 or 1 */
23 u8 reserved7;
24 } __packed;
25
26 #define CMD_EC_INFO 0x38
27 enum get_ec_info_op {
28 CMD_GET_EC_LABEL = 0,
29 CMD_GET_EC_REV = 1,
30 CMD_GET_EC_MODEL = 2,
31 CMD_GET_EC_BUILD_DATE = 3,
32 };
33
34 struct get_ec_info_req {
35 u8 cmd; /* Always CMD_EC_INFO */
36 u8 reserved;
37 u8 op; /* One of enum get_ec_info_op */
38 } __packed;
39
40 struct get_ec_info_resp {
41 u8 reserved[2];
42 char value[9]; /* __nonstring: might not be null terminated */
43 } __packed;
44
boot_on_ac_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)45 static ssize_t boot_on_ac_store(struct device *dev,
46 struct device_attribute *attr,
47 const char *buf, size_t count)
48 {
49 struct wilco_ec_device *ec = dev_get_drvdata(dev);
50 struct boot_on_ac_request rq;
51 struct wilco_ec_message msg;
52 int ret;
53 u8 val;
54
55 ret = kstrtou8(buf, 10, &val);
56 if (ret < 0)
57 return ret;
58 if (val > 1)
59 return -EINVAL;
60
61 memset(&rq, 0, sizeof(rq));
62 rq.cmd = CMD_KB_CMOS;
63 rq.sub_cmd = SUB_CMD_KB_CMOS_AUTO_ON;
64 rq.val = val;
65
66 memset(&msg, 0, sizeof(msg));
67 msg.type = WILCO_EC_MSG_LEGACY;
68 msg.request_data = &rq;
69 msg.request_size = sizeof(rq);
70 ret = wilco_ec_mailbox(ec, &msg);
71 if (ret < 0)
72 return ret;
73
74 return count;
75 }
76
77 static DEVICE_ATTR_WO(boot_on_ac);
78
get_info(struct device * dev,char * buf,enum get_ec_info_op op)79 static ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
80 {
81 struct wilco_ec_device *ec = dev_get_drvdata(dev);
82 struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
83 struct get_ec_info_resp resp;
84 int ret;
85
86 struct wilco_ec_message msg = {
87 .type = WILCO_EC_MSG_LEGACY,
88 .request_data = &req,
89 .request_size = sizeof(req),
90 .response_data = &resp,
91 .response_size = sizeof(resp),
92 };
93
94 ret = wilco_ec_mailbox(ec, &msg);
95 if (ret < 0)
96 return ret;
97
98 return scnprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(resp.value),
99 (char *)&resp.value);
100 }
101
version_show(struct device * dev,struct device_attribute * attr,char * buf)102 static ssize_t version_show(struct device *dev, struct device_attribute *attr,
103 char *buf)
104 {
105 return get_info(dev, buf, CMD_GET_EC_LABEL);
106 }
107
108 static DEVICE_ATTR_RO(version);
109
build_revision_show(struct device * dev,struct device_attribute * attr,char * buf)110 static ssize_t build_revision_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
112 {
113 return get_info(dev, buf, CMD_GET_EC_REV);
114 }
115
116 static DEVICE_ATTR_RO(build_revision);
117
build_date_show(struct device * dev,struct device_attribute * attr,char * buf)118 static ssize_t build_date_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120 {
121 return get_info(dev, buf, CMD_GET_EC_BUILD_DATE);
122 }
123
124 static DEVICE_ATTR_RO(build_date);
125
model_number_show(struct device * dev,struct device_attribute * attr,char * buf)126 static ssize_t model_number_show(struct device *dev,
127 struct device_attribute *attr, char *buf)
128 {
129 return get_info(dev, buf, CMD_GET_EC_MODEL);
130 }
131
132 static DEVICE_ATTR_RO(model_number);
133
134
135 static struct attribute *wilco_dev_attrs[] = {
136 &dev_attr_boot_on_ac.attr,
137 &dev_attr_build_date.attr,
138 &dev_attr_build_revision.attr,
139 &dev_attr_model_number.attr,
140 &dev_attr_version.attr,
141 NULL,
142 };
143
144 static struct attribute_group wilco_dev_attr_group = {
145 .attrs = wilco_dev_attrs,
146 };
147
wilco_ec_add_sysfs(struct wilco_ec_device * ec)148 int wilco_ec_add_sysfs(struct wilco_ec_device *ec)
149 {
150 return sysfs_create_group(&ec->dev->kobj, &wilco_dev_attr_group);
151 }
152
wilco_ec_remove_sysfs(struct wilco_ec_device * ec)153 void wilco_ec_remove_sysfs(struct wilco_ec_device *ec)
154 {
155 sysfs_remove_group(&ec->dev->kobj, &wilco_dev_attr_group);
156 }
157
